Question

A box contains 28 bulbs of which 7 bulbs are defective , a bulb is drawn randomly from the box.find the probability of picking a non-defective bulb.​

Answer 1

Answer:

Step-by-step explanation:

Answer 2

Answer:total number of bulbs=28

Number of detective bulbs=7

Number of non-defective bulb=28-7=21

If a bulb is drawn at random,then the probability of picking a detective bulb:-

(Number of non-defective detective bulbs)/(Total number of bulbs in the box)

=21/28

=3/4

Therefore the probability of picking a non-defective bulb =3/4

Step-by-step explanation: